Thirds to james jenkins and alfred harbold



(No Model.)

R. C. NUGENT.

. INSIDE GALIPERS.

No. 484,813. Patented'Oct. 25, 1892.

Ja's Jflarne ys UNITED STATES:

PATENT OFFICE.

RICHARD C. NUGENT, OF HARRISBURG, PENNSYLVANIA, ASSIGNOR OF TWO- THIRDS TO JAMES JENKINS AND ALFRED IIARBOLD, OF SAME PLACE.

INSIDE CALI PERS.

SPECIFICATION forming part of Letters Patent No. 484,813, dated October 25, 1892.

Application filed January 12, I892. Serial No. 417,826. (No model.)

T all whom it may concern.-

Be it known that I, RICHARD O. NUGENT, of Harrisburg, in the county of Dauphin and State of Pennsylvania, have invented certain new and useful Improvements in Gages; and

I do hereby declare the following to bea full,

clear, and exact description of the same, refer ence being had to the accompanying drawings, forlninga part of this specification, and to the [0 letters of reference marked thereon.

The object of the present invention is to provide a gage designed particularly for measuring and determining inside diameters, the parallelism of the inner circumference or wall I 5 of a tubular article, &c., with great accuracy,

and, further, to provide a tool of this character which may be set to different standards and made secure against accidental disar rangement of adjustment while in use.

The invention consists in a tool of the character indicated embodying certain novel de tails of construction and combinations and arrangements of parts, all as will be now described, and pointed out particularly in the 2 5 appended claims.

In the accompanying drawings, Figure 1 is a perspective view of a tool constructed in accordance with my present invention. Fig. 2 is a longitudinal section of the tool, taken 0 through one gage-plate, with the other in elevation, or on line 1 1, Fig. 5. Fig. 3 is a similar view taken between two of the gageplates, or on line 2 2, Fig. 5. Fig. 4 is a transverse section taken through one of the 5 expanders on line 3 3, Fig. 3. Fig. 5 is a similar view through the center of the tool on line 4 4, Figs. 2 and 3.

Like letters of reference indicate the same parts in all the figures.

In carrying the invention into practice I ennploy a series of radially-movable gage-plates connected with oppositely-arranged expanders operated from a'single shaft and adapted to move said plates outward and at the same time preserve the parallelism of their outer edges.

The drawings represent a tool having four gage-plates A, sliding and guided by a frame to be presently described and having their inner edges oppositely inclined and formed into dovetails a, with which co-operate oppositely-arranged expanders or nuts B, having correspondingly-inclined dovetail recesses b. When the expanders are moved in: opposite directions, it is obvious that the plates will be moved outward simultaneously, and to secure this movement of the expanders they are mounted on a shaft 0, having oppositely-arranged or right and left hand screw-threads c thereon co-operating with the expanders and adapted to move the same when the shaft is rotated, as will be readily understood.

The main part of the frame carrying the movable parts consists of the central ring D, which forms the connection between the side pieces D, extending from end to end of the tool. The spaces between the side pieces form slots or wings for the gage-plates, and the cylindrical openings between them at the center form guideways in which the expanders travel. Each gage-plate is cut out at the center at d ,to accommodate the ring D, which may thus be made to perform the function of a guide to prevent, longitudinal movement of the plates, though it is hardly necessary, as the end or face plates E perform this function more effectually. These end plates E are secured to the side pieces D by screws d, and

besides serving to guide and hold the gageplates they prevent the longitudinal movement of the shaft, the latter being provided with shoulders c, which abut against the end plates, as shown. One of the end.or face plates D is provided with a tubular extension D serving as a handle and preferably having a wood covering D while at the outer end it is provided with an annular head F, upon which a cap G is adapted to screw tightly. The shaft 0 is prolonged at one end and passes through the handle or to a point near the upper end of the same, where it is squared for the reception of a key H. The end of the shaft is adapted to be covered by the cap. Thus the gage may be set to a standard and the cap screwed on, when it will be found impos- 5 sible to disarrange the gage-plates by rough usage without actually destroying the tool. It is highly desirable, of course, to determine the extent of movement of the gage-plates, and for this purpose the forward end of the shaft is provided with an indicator co-operating with a series of graduations on the faceplate, as shown. The indicator consists of a disk I, fitting snugly against theface-plate or in a recess therein and provided with a screw-threaded extension screwing into the end of the shaft. On the outer face the disk is provided with a mark or marks-such as 2' adapted to be brought into alignment with any of the graduated marks on the face-plate, or vice versa. A convenient arrangement is to graduate the circle to indicate hundredths of an inch, as shown, where a complete turn indicates that the gage-plates have been moved fourone-hundredths of an inch. There is little danger of its getting out of order, and as there are no open joints into which dust, turnings, or chips can enter it is found especially useful for general shop use.

- To alter the adjustment of the tool, the operator removes the cap G, applies the key H to the squared end of the shaft 0, and turns it forward or backward, as necessary, to move the expanders B B toward or away from each other and through them secure the radial movement of the plates A, the outer edges of which, as before explained, constitute the gage-surfaces.

In use the gage is thrust into the article to be measured or a caliper measurement may be taken from it. By reason of the long parallel surfaces the tool is particularly adapted to determine the accuracy of cylinders, such as bearings, &c., wherein its greatest field of usefulness will be found.

Having thus described my' invention, what I claim as new is- 1. In a gage such as described, the combination, with the frame having the slots or ways therein and the gage-plates Working in said slots or ways and having the oppositely-inclined inner edges, of the oppositely-arranged expanders movably connected with the inner edges of the plates and the shaft co-operating with both said expanders, substantially as described.

2. In a gage such as described, the combination, with the frame having the slots or ways and central cylindrical openings and the gageplates working in said slots or ways and having the oppositely-inclined inner edges, of the oppositely-arranged expanders movably connected with the inner edges of the plates and working in the central cylindrical opening and the shaft having the right and left hand threads co-operatin g with said expanders, substantially as described.

3. In a gage such as described, the combination,with the frame having the radial slots or ways formed by side pieces and the central connecting-ring and the gage-plates working in said slots or ways and having their centers cut out to accommodate the connecting-ring, of the expanders co-operating with the inner edges of the plate and the single shaft for moving said expanders, substantially as described.

4. In a gage such as described, the combination, with the frame having the radial slots or ways and the handle at one end and the series of radially-movable gage-plates carried by the frame, of the expanders co-operating with the plates and the shaft for moving the expanders, extending out through the handle, substantially as described.

5. In a gage such as described, the combination, with the frame having the tubular handle at one end and the series of radiallymovable gage-plates carried by the frame, of the oppositely-arranged expanders for moving the plates, the shaft for moving the expanders extending out through the handle and the cap for closing the end of the handle and covering the end of the shaft, substantially as described.

6. In a gage such as described, the combination,with the frame having the slots or ways, the gage-plates working in said slots or ways, the end plates, and the tubular handles secured to one of the end plates, of the expanders co-operatin g with the gage-plates, the shaft having the right and left hand screw-threads co-operating with the expander-s, the shoulders on the shaft engaging the end plates, and the end extension passing out through the tubular handle, substantially as described.

7. In a gage such as described, the combination, with the frame having the slots or ways therein and the end plates, of the gage-plates working in the slots or ways, the expanders co-operating with the gage-plates, and the screw-threaded shaft having the shoulders engaging the end plates to prevent longitudinal movement of the shaft, substantially as described.

8. In a gage such as described, the combination, with the frame having the end plates, the radially-movable gage-plates carried by the frame, and the oppositely-arranged expandersco-operating with the gage-plates, of the shaft for moving the expanders, passing through the end plates and provided with meansat one end whereby it is turned, and an indicator carried by the opposite end, substantially as described.

RICHARD O. NUGENT.

Witnesses:

MAURY D. JENKINS, ALBERT J. FAGER. 

